kernel/drivers/mtd/nand/lpc32xx_mlc.c

   1 /*
   2  * Driver for NAND MLC Controller in LPC32xx
   3  *
   4  * Author: Roland Stigge <stigge@antcom.de>
   5  *
   6  * Copyright © 2011 WORK Microwave GmbH
   7  * Copyright © 2011, 2012 Roland Stigge
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  *
  20  * NAND Flash Controller Operation:
  21  * - Read: Auto Decode
  22  * - Write: Auto Encode
  23  * - Tested Page Sizes: 2048, 4096
  24  */
  25
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/nand.h>
  31 #include <linux/mtd/partitions.h>
  32 #include <linux/clk.h>
  33 #include <linux/err.h>
  34 #include <linux/delay.h>
  35 #include <linux/completion.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/of.h>
  38 #include <linux/of_mtd.h>
  39 #include <linux/of_gpio.h>
  40 #include <linux/mtd/lpc32xx_mlc.h>
  41 #include <linux/io.h>
  42 #include <linux/mm.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/dmaengine.h>
  45 #include <linux/mtd/nand_ecc.h>
  46
  47 #define DRV_NAME "lpc32xx_mlc"
  48
  49 /**********************************************************************
  50 * MLC NAND controller register offsets
  51 **********************************************************************/
  52
  53 #define MLC_BUFF(x)                     (x + 0x00000)
  54 #define MLC_DATA(x)                     (x + 0x08000)
  55 #define MLC_CMD(x)                      (x + 0x10000)
  56 #define MLC_ADDR(x)                     (x + 0x10004)
  57 #define MLC_ECC_ENC_REG(x)              (x + 0x10008)
  58 #define MLC_ECC_DEC_REG(x)              (x + 0x1000C)
  59 #define MLC_ECC_AUTO_ENC_REG(x)         (x + 0x10010)
  60 #define MLC_ECC_AUTO_DEC_REG(x)         (x + 0x10014)
  61 #define MLC_RPR(x)                      (x + 0x10018)
  62 #define MLC_WPR(x)                      (x + 0x1001C)
  63 #define MLC_RUBP(x)                     (x + 0x10020)
  64 #define MLC_ROBP(x)                     (x + 0x10024)
  65 #define MLC_SW_WP_ADD_LOW(x)            (x + 0x10028)
  66 #define MLC_SW_WP_ADD_HIG(x)            (x + 0x1002C)
  67 #define MLC_ICR(x)                      (x + 0x10030)
  68 #define MLC_TIME_REG(x)                 (x + 0x10034)
  69 #define MLC_IRQ_MR(x)                   (x + 0x10038)
  70 #define MLC_IRQ_SR(x)                   (x + 0x1003C)
  71 #define MLC_LOCK_PR(x)                  (x + 0x10044)
  72 #define MLC_ISR(x)                      (x + 0x10048)
  73 #define MLC_CEH(x)                      (x + 0x1004C)
  74
  75 /**********************************************************************
  76 * MLC_CMD bit definitions
  77 **********************************************************************/
  78 #define MLCCMD_RESET                    0xFF
  79
  80 /**********************************************************************
  81 * MLC_ICR bit definitions
  82 **********************************************************************/
  83 #define MLCICR_WPROT                    (1 << 3)
  84 #define MLCICR_LARGEBLOCK               (1 << 2)
  85 #define MLCICR_LONGADDR                 (1 << 1)
  86 #define MLCICR_16BIT                    (1 << 0)  /* unsupported by LPC32x0! */
  87
  88 /**********************************************************************
  89 * MLC_TIME_REG bit definitions
  90 **********************************************************************/
  91 #define MLCTIMEREG_TCEA_DELAY(n)        (((n) & 0x03) << 24)
  92 #define MLCTIMEREG_BUSY_DELAY(n)        (((n) & 0x1F) << 19)
  93 #define MLCTIMEREG_NAND_TA(n)           (((n) & 0x07) << 16)
  94 #define MLCTIMEREG_RD_HIGH(n)           (((n) & 0x0F) << 12)
  95 #define MLCTIMEREG_RD_LOW(n)            (((n) & 0x0F) << 8)
  96 #define MLCTIMEREG_WR_HIGH(n)           (((n) & 0x0F) << 4)
  97 #define MLCTIMEREG_WR_LOW(n)            (((n) & 0x0F) << 0)
  98
  99 /**********************************************************************
 100 * MLC_IRQ_MR and MLC_IRQ_SR bit definitions
 101 **********************************************************************/
 102 #define MLCIRQ_NAND_READY               (1 << 5)
 103 #define MLCIRQ_CONTROLLER_READY         (1 << 4)
 104 #define MLCIRQ_DECODE_FAILURE           (1 << 3)
 105 #define MLCIRQ_DECODE_ERROR             (1 << 2)
 106 #define MLCIRQ_ECC_READY                (1 << 1)
 107 #define MLCIRQ_WRPROT_FAULT             (1 << 0)
 108
 109 /**********************************************************************
 110 * MLC_LOCK_PR bit definitions
 111 **********************************************************************/
 112 #define MLCLOCKPR_MAGIC                 0xA25E
 113
 114 /**********************************************************************
 115 * MLC_ISR bit definitions
 116 **********************************************************************/
 117 #define MLCISR_DECODER_FAILURE          (1 << 6)
 118 #define MLCISR_ERRORS                   ((1 << 4) | (1 << 5))
 119 #define MLCISR_ERRORS_DETECTED          (1 << 3)
 120 #define MLCISR_ECC_READY                (1 << 2)
 121 #define MLCISR_CONTROLLER_READY         (1 << 1)
 122 #define MLCISR_NAND_READY               (1 << 0)
 123
 124 /**********************************************************************
 125 * MLC_CEH bit definitions
 126 **********************************************************************/
 127 #define MLCCEH_NORMAL                   (1 << 0)
 128
 129 struct lpc32xx_nand_cfg_mlc {
 130         uint32_t tcea_delay;
 131         uint32_t busy_delay;
 132         uint32_t nand_ta;
 133         uint32_t rd_high;
 134         uint32_t rd_low;
 135         uint32_t wr_high;
 136         uint32_t wr_low;
 137         int wp_gpio;
 138         struct mtd_partition *parts;
 139         unsigned num_parts;
 140 };
 141
 142 static struct nand_ecclayout lpc32xx_nand_oob = {
 143         .eccbytes = 40,
 144         .eccpos = { 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
 145                    22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
 146                    38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
 147                    54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
 148         .oobfree = {
 149                 { .offset = 0,
 150                   .length = 6, },
 151                 { .offset = 16,
 152                   .length = 6, },
 153                 { .offset = 32,
 154                   .length = 6, },
 155                 { .offset = 48,
 156                   .length = 6, },
 157                 },
 158 };
 159
 160 static struct nand_bbt_descr lpc32xx_nand_bbt = {
 161         .options = NAND_BBT_ABSPAGE | NAND_BBT_2BIT | NAND_BBT_NO_OOB |
 162                    NAND_BBT_WRITE,
 163         .pages = { 524224, 0, 0, 0, 0, 0, 0, 0 },
 164 };
 165
 166 static struct nand_bbt_descr lpc32xx_nand_bbt_mirror = {
 167         .options = NAND_BBT_ABSPAGE | NAND_BBT_2BIT | NAND_BBT_NO_OOB |
 168                    NAND_BBT_WRITE,
 169         .pages = { 524160, 0, 0, 0, 0, 0, 0, 0 },
 170 };
 171
 172 struct lpc32xx_nand_host {
 173         struct nand_chip        nand_chip;
 174         struct lpc32xx_mlc_platform_data *pdata;
 175         struct clk              *clk;
 176         struct mtd_info         mtd;
 177         void __iomem            *io_base;
 178         int                     irq;
 179         struct lpc32xx_nand_cfg_mlc     *ncfg;
 180         struct completion       comp_nand;
 181         struct completion       comp_controller;
 182         uint32_t llptr;
 183         /*
 184          * Physical addresses of ECC buffer, DMA data buffers, OOB data buffer
 185          */
 186         dma_addr_t              oob_buf_phy;
 187         /*
 188          * Virtual addresses of ECC buffer, DMA data buffers, OOB data buffer
 189          */
 190         uint8_t                 *oob_buf;
 191         /* Physical address of DMA base address */
 192         dma_addr_t              io_base_phy;
 193
 194         struct completion       comp_dma;
 195         struct dma_chan         *dma_chan;
 196         struct dma_slave_config dma_slave_config;
 197         struct scatterlist      sgl;
 198         uint8_t                 *dma_buf;
 199         uint8_t                 *dummy_buf;
 200         int                     mlcsubpages; /* number of 512bytes-subpages */
 201 };
 202
 203 /*
 204  * Activate/Deactivate DMA Operation:
 205  *
 206  * Using the PL080 DMA Controller for transferring the 512 byte subpages
 207  * instead of doing readl() / writel() in a loop slows it down significantly.
 208  * Measurements via getnstimeofday() upon 512 byte subpage reads reveal:
 209  *
 210  * - readl() of 128 x 32 bits in a loop: ~20us
 211  * - DMA read of 512 bytes (32 bit, 4...128 words bursts): ~60us
 212  * - DMA read of 512 bytes (32 bit, no bursts): ~100us
 213  *
 214  * This applies to the transfer itself. In the DMA case: only the
 215  * wait_for_completion() (DMA setup _not_ included).
 216  *
 217  * Note that the 512 bytes subpage transfer is done directly from/to a
 218  * FIFO/buffer inside the NAND controller. Most of the time (~400-800us for a
 219  * 2048 bytes page) is spent waiting for the NAND IRQ, anyway. (The NAND
 220  * controller transferring data between its internal buffer to/from the NAND
 221  * chip.)
 222  *
 223  * Therefore, using the PL080 DMA is disabled by default, for now.
 224  *
 225  */
 226 static int use_dma;
 227
 228 static void lpc32xx_nand_setup(struct lpc32xx_nand_host *host)
 229 {
 230         uint32_t clkrate, tmp;
 231
 232         /* Reset MLC controller */
 233         writel(MLCCMD_RESET, MLC_CMD(host->io_base));
 234         udelay(1000);
 235
 236         /* Get base clock for MLC block */
 237         clkrate = clk_get_rate(host->clk);
 238         if (clkrate == 0)
 239                 clkrate = 104000000;
 240
 241         /* Unlock MLC_ICR
 242          * (among others, will be locked again automatically) */
 243         writew(MLCLOCKPR_MAGIC, MLC_LOCK_PR(host->io_base));
 244
 245         /* Configure MLC Controller: Large Block, 5 Byte Address */
 246         tmp = MLCICR_LARGEBLOCK | MLCICR_LONGADDR;
 247         writel(tmp, MLC_ICR(host->io_base));
 248
 249         /* Unlock MLC_TIME_REG
 250          * (among others, will be locked again automatically) */
 251         writew(MLCLOCKPR_MAGIC, MLC_LOCK_PR(host->io_base));
 252
 253         /* Compute clock setup values, see LPC and NAND manual */
 254         tmp = 0;
 255         tmp |= MLCTIMEREG_TCEA_DELAY(clkrate / host->ncfg->tcea_delay + 1);
 256         tmp |= MLCTIMEREG_BUSY_DELAY(clkrate / host->ncfg->busy_delay + 1);
 257         tmp |= MLCTIMEREG_NAND_TA(clkrate / host->ncfg->nand_ta + 1);
 258         tmp |= MLCTIMEREG_RD_HIGH(clkrate / host->ncfg->rd_high + 1);
 259         tmp |= MLCTIMEREG_RD_LOW(clkrate / host->ncfg->rd_low);
 260         tmp |= MLCTIMEREG_WR_HIGH(clkrate / host->ncfg->wr_high + 1);
 261         tmp |= MLCTIMEREG_WR_LOW(clkrate / host->ncfg->wr_low);
 262         writel(tmp, MLC_TIME_REG(host->io_base));
 263
 264         /* Enable IRQ for CONTROLLER_READY and NAND_READY */
 265         writeb(MLCIRQ_CONTROLLER_READY | MLCIRQ_NAND_READY,
 266                         MLC_IRQ_MR(host->io_base));
 267
 268         /* Normal nCE operation: nCE controlled by controller */
 269         writel(MLCCEH_NORMAL, MLC_CEH(host->io_base));
 270 }
 271
 272 /*
 273  * Hardware specific access to control lines
 274  */
 275 static void lpc32xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
 276                                   unsigned int ctrl)
 277 {
 278         struct nand_chip *nand_chip = mtd->priv;
 279         struct lpc32xx_nand_host *host = nand_chip->priv;
 280
 281         if (cmd != NAND_CMD_NONE) {
 282                 if (ctrl & NAND_CLE)
 283                         writel(cmd, MLC_CMD(host->io_base));
 284                 else
 285                         writel(cmd, MLC_ADDR(host->io_base));
 286         }
 287 }
 288
 289 /*
 290  * Read Device Ready (NAND device _and_ controller ready)
 291  */
 292 static int lpc32xx_nand_device_ready(struct mtd_info *mtd)
 293 {
 294         struct nand_chip *nand_chip = mtd->priv;
 295         struct lpc32xx_nand_host *host = nand_chip->priv;
 296
 297         if ((readb(MLC_ISR(host->io_base)) &
 298              (MLCISR_CONTROLLER_READY | MLCISR_NAND_READY)) ==
 299             (MLCISR_CONTROLLER_READY | MLCISR_NAND_READY))
 300                 return  1;
 301
 302         return 0;
 303 }
 304
 305 static irqreturn_t lpc3xxx_nand_irq(int irq, struct lpc32xx_nand_host *host)
 306 {
 307         uint8_t sr;
 308
 309         /* Clear interrupt flag by reading status */
 310         sr = readb(MLC_IRQ_SR(host->io_base));
 311         if (sr & MLCIRQ_NAND_READY)
 312                 complete(&host->comp_nand);
 313         if (sr & MLCIRQ_CONTROLLER_READY)
 314                 complete(&host->comp_controller);
 315
 316         return IRQ_HANDLED;
 317 }
 318
 319 static int lpc32xx_waitfunc_nand(struct mtd_info *mtd, struct nand_chip *chip)
 320 {
 321         struct lpc32xx_nand_host *host = chip->priv;
 322
 323         if (readb(MLC_ISR(host->io_base)) & MLCISR_NAND_READY)
 324                 goto exit;
 325
 326         wait_for_completion(&host->comp_nand);
 327
 328         while (!(readb(MLC_ISR(host->io_base)) & MLCISR_NAND_READY)) {
 329                 /* Seems to be delayed sometimes by controller */
 330                 dev_dbg(&mtd->dev, "Warning: NAND not ready.\n");
 331                 cpu_relax();
 332         }
 333
 334 exit:
 335         return NAND_STATUS_READY;
 336 }
 337
 338 static int lpc32xx_waitfunc_controller(struct mtd_info *mtd,
 339                                        struct nand_chip *chip)
 340 {
 341         struct lpc32xx_nand_host *host = chip->priv;
 342
 343         if (readb(MLC_ISR(host->io_base)) & MLCISR_CONTROLLER_READY)
 344                 goto exit;
 345
 346         wait_for_completion(&host->comp_controller);
 347
 348         while (!(readb(MLC_ISR(host->io_base)) &
 349                  MLCISR_CONTROLLER_READY)) {
 350                 dev_dbg(&mtd->dev, "Warning: Controller not ready.\n");
 351                 cpu_relax();
 352         }
 353
 354 exit:
 355         return NAND_STATUS_READY;
 356 }
 357
 358 static int lpc32xx_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
 359 {
 360         lpc32xx_waitfunc_nand(mtd, chip);
 361         lpc32xx_waitfunc_controller(mtd, chip);
 362
 363         return NAND_STATUS_READY;
 364 }
 365
 366 /*
 367  * Enable NAND write protect
 368  */
 369 static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
 370 {
 371         if (gpio_is_valid(host->ncfg->wp_gpio))
 372                 gpio_set_value(host->ncfg->wp_gpio, 0);
 373 }
 374
 375 /*
 376  * Disable NAND write protect
 377  */
 378 static void lpc32xx_wp_disable(struct lpc32xx_nand_host *host)
 379 {
 380         if (gpio_is_valid(host->ncfg->wp_gpio))
 381                 gpio_set_value(host->ncfg->wp_gpio, 1);
 382 }
 383
 384 static void lpc32xx_dma_complete_func(void *completion)
 385 {
 386         complete(completion);
 387 }
 388
 389 static int lpc32xx_xmit_dma(struct mtd_info *mtd, void *mem, int len,
 390                             enum dma_transfer_direction dir)
 391 {
 392         struct nand_chip *chip = mtd->priv;
 393         struct lpc32xx_nand_host *host = chip->priv;
 394         struct dma_async_tx_descriptor *desc;
 395         int flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 396         int res;
 397
 398         sg_init_one(&host->sgl, mem, len);
 399
 400         res = dma_map_sg(host->dma_chan->device->dev, &host->sgl, 1,
 401                          DMA_BIDIRECTIONAL);
 402         if (res != 1) {
 403                 dev_err(mtd->dev.parent, "Failed to map sg list\n");
 404                 return -ENXIO;
 405         }
 406         desc = dmaengine_prep_slave_sg(host->dma_chan, &host->sgl, 1, dir,
 407                                        flags);
 408         if (!desc) {
 409                 dev_err(mtd->dev.parent, "Failed to prepare slave sg\n");
 410                 goto out1;
 411         }
 412
 413         init_completion(&host->comp_dma);
 414         desc->callback = lpc32xx_dma_complete_func;
 415         desc->callback_param = &host->comp_dma;
 416
 417         dmaengine_submit(desc);
 418         dma_async_issue_pending(host->dma_chan);
 419
 420         wait_for_completion_timeout(&host->comp_dma, msecs_to_jiffies(1000));
 421
 422         dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1,
 423                      DMA_BIDIRECTIONAL);
 424         return 0;
 425 out1:
 426         dma_unmap_sg(host->dma_chan->device->dev, &host->sgl, 1,
 427                      DMA_BIDIRECTIONAL);
 428         return -ENXIO;
 429 }
 430
 431 static int lpc32xx_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 432                              uint8_t *buf, int oob_required, int page)
 433 {
 434         struct lpc32xx_nand_host *host = chip->priv;
 435         int i, j;
 436         uint8_t *oobbuf = chip->oob_poi;
 437         uint32_t mlc_isr;
 438         int res;
 439         uint8_t *dma_buf;
 440         bool dma_mapped;
 441
 442         if ((void *)buf <= high_memory) {
 443                 dma_buf = buf;
 444                 dma_mapped = true;
 445         } else {
 446                 dma_buf = host->dma_buf;
 447                 dma_mapped = false;
 448         }
 449
 450         /* Writing Command and Address */
 451         chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 452
 453         /* For all sub-pages */
 454         for (i = 0; i < host->mlcsubpages; i++) {
 455                 /* Start Auto Decode Command */
 456                 writeb(0x00, MLC_ECC_AUTO_DEC_REG(host->io_base));
 457
 458                 /* Wait for Controller Ready */
 459                 lpc32xx_waitfunc_controller(mtd, chip);
 460
 461                 /* Check ECC Error status */
 462                 mlc_isr = readl(MLC_ISR(host->io_base));
 463                 if (mlc_isr & MLCISR_DECODER_FAILURE) {
 464                         mtd->ecc_stats.failed++;
 465                         dev_warn(&mtd->dev, "%s: DECODER_FAILURE\n", __func__);
 466                 } else if (mlc_isr & MLCISR_ERRORS_DETECTED) {
 467                         mtd->ecc_stats.corrected += ((mlc_isr >> 4) & 0x3) + 1;
 468                 }
 469
 470                 /* Read 512 + 16 Bytes */
 471                 if (use_dma) {
 472                         res = lpc32xx_xmit_dma(mtd, dma_buf + i * 512, 512,
 473                                                DMA_DEV_TO_MEM);
 474                         if (res)
 475                                 return res;
 476                 } else {
 477                         for (j = 0; j < (512 >> 2); j++) {
 478                                 *((uint32_t *)(buf)) =
 479                                         readl(MLC_BUFF(host->io_base));
 480                                 buf += 4;
 481                         }
 482                 }
 483                 for (j = 0; j < (16 >> 2); j++) {
 484                         *((uint32_t *)(oobbuf)) =
 485                                 readl(MLC_BUFF(host->io_base));
 486                         oobbuf += 4;
 487                 }
 488         }
 489
 490         if (use_dma && !dma_mapped)
 491                 memcpy(buf, dma_buf, mtd->writesize);
 492
 493         return 0;
 494 }
 495
 496 static int lpc32xx_write_page_lowlevel(struct mtd_info *mtd,
 497                                        struct nand_chip *chip,
 498                                        const uint8_t *buf, int oob_required,
 499                                        int page)
 500 {
 501         struct lpc32xx_nand_host *host = chip->priv;
 502         const uint8_t *oobbuf = chip->oob_poi;
 503         uint8_t *dma_buf = (uint8_t *)buf;
 504         int res;
 505         int i, j;
 506
 507         if (use_dma && (void *)buf >= high_memory) {
 508                 dma_buf = host->dma_buf;
 509                 memcpy(dma_buf, buf, mtd->writesize);
 510         }
 511
 512         for (i = 0; i < host->mlcsubpages; i++) {
 513                 /* Start Encode */
 514                 writeb(0x00, MLC_ECC_ENC_REG(host->io_base));
 515
 516                 /* Write 512 + 6 Bytes to Buffer */
 517                 if (use_dma) {
 518                         res = lpc32xx_xmit_dma(mtd, dma_buf + i * 512, 512,
 519                                                DMA_MEM_TO_DEV);
 520                         if (res)
 521                                 return res;
 522                 } else {
 523                         for (j = 0; j < (512 >> 2); j++) {
 524                                 writel(*((uint32_t *)(buf)),
 525                                        MLC_BUFF(host->io_base));
 526                                 buf += 4;
 527                         }
 528                 }
 529                 writel(*((uint32_t *)(oobbuf)), MLC_BUFF(host->io_base));
 530                 oobbuf += 4;
 531                 writew(*((uint16_t *)(oobbuf)), MLC_BUFF(host->io_base));
 532                 oobbuf += 12;
 533
 534                 /* Auto Encode w/ Bit 8 = 0 (see LPC MLC Controller manual) */
 535                 writeb(0x00, MLC_ECC_AUTO_ENC_REG(host->io_base));
 536
 537                 /* Wait for Controller Ready */
 538                 lpc32xx_waitfunc_controller(mtd, chip);
 539         }
 540         return 0;
 541 }
 542
 543 static int lpc32xx_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 544                             int page)
 545 {
 546         struct lpc32xx_nand_host *host = chip->priv;
 547
 548         /* Read whole page - necessary with MLC controller! */
 549         lpc32xx_read_page(mtd, chip, host->dummy_buf, 1, page);
 550
 551         return 0;
 552 }
 553
 554 static int lpc32xx_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
 555                               int page)
 556 {
 557         /* None, write_oob conflicts with the automatic LPC MLC ECC decoder! */
 558         return 0;
 559 }
 560
 561 /* Prepares MLC for transfers with H/W ECC enabled: always enabled anyway */
 562 static void lpc32xx_ecc_enable(struct mtd_info *mtd, int mode)
 563 {
 564         /* Always enabled! */
 565 }
 566
 567 static int lpc32xx_dma_setup(struct lpc32xx_nand_host *host)
 568 {
 569         struct mtd_info *mtd = &host->mtd;
 570         dma_cap_mask_t mask;
 571
 572         if (!host->pdata || !host->pdata->dma_filter) {
 573                 dev_err(mtd->dev.parent, "no DMA platform data\n");
 574                 return -ENOENT;
 575         }
 576
 577         dma_cap_zero(mask);
 578         dma_cap_set(DMA_SLAVE, mask);
 579         host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
 580                                              "nand-mlc");
 581         if (!host->dma_chan) {
 582                 dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
 583                 return -EBUSY;
 584         }
 585
 586         /*
 587          * Set direction to a sensible value even if the dmaengine driver
 588          * should ignore it. With the default (DMA_MEM_TO_MEM), the amba-pl08x
 589          * driver criticizes it as "alien transfer direction".
 590          */
 591         host->dma_slave_config.direction = DMA_DEV_TO_MEM;
 592         host->dma_slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 593         host->dma_slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 594         host->dma_slave_config.src_maxburst = 128;
 595         host->dma_slave_config.dst_maxburst = 128;
 596         /* DMA controller does flow control: */
 597         host->dma_slave_config.device_fc = false;
 598         host->dma_slave_config.src_addr = MLC_BUFF(host->io_base_phy);
 599         host->dma_slave_config.dst_addr = MLC_BUFF(host->io_base_phy);
 600         if (dmaengine_slave_config(host->dma_chan, &host->dma_slave_config)) {
 601                 dev_err(mtd->dev.parent, "Failed to setup DMA slave\n");
 602                 goto out1;
 603         }
 604
 605         return 0;
 606 out1:
 607         dma_release_channel(host->dma_chan);
 608         return -ENXIO;
 609 }
 610
 611 static struct lpc32xx_nand_cfg_mlc *lpc32xx_parse_dt(struct device *dev)
 612 {
 613         struct lpc32xx_nand_cfg_mlc *ncfg;
 614         struct device_node *np = dev->of_node;
 615
 616         ncfg = devm_kzalloc(dev, sizeof(*ncfg), GFP_KERNEL);
 617         if (!ncfg)
 618                 return NULL;
 619
 620         of_property_read_u32(np, "nxp,tcea-delay", &ncfg->tcea_delay);
 621         of_property_read_u32(np, "nxp,busy-delay", &ncfg->busy_delay);
 622         of_property_read_u32(np, "nxp,nand-ta", &ncfg->nand_ta);
 623         of_property_read_u32(np, "nxp,rd-high", &ncfg->rd_high);
 624         of_property_read_u32(np, "nxp,rd-low", &ncfg->rd_low);
 625         of_property_read_u32(np, "nxp,wr-high", &ncfg->wr_high);
 626         of_property_read_u32(np, "nxp,wr-low", &ncfg->wr_low);
 627
 628         if (!ncfg->tcea_delay || !ncfg->busy_delay || !ncfg->nand_ta ||
 629             !ncfg->rd_high || !ncfg->rd_low || !ncfg->wr_high ||
 630             !ncfg->wr_low) {
 631                 dev_err(dev, "chip parameters not specified correctly\n");
 632                 return NULL;
 633         }
 634
 635         ncfg->wp_gpio = of_get_named_gpio(np, "gpios", 0);
 636
 637         return ncfg;
 638 }
 639
 640 /*
 641  * Probe for NAND controller
 642  */
 643 static int lpc32xx_nand_probe(struct platform_device *pdev)
 644 {
 645         struct lpc32xx_nand_host *host;
 646         struct mtd_info *mtd;
 647         struct nand_chip *nand_chip;
 648         struct resource *rc;
 649         int res;
 650         struct mtd_part_parser_data ppdata = {};
 651
 652         /* Allocate memory for the device structure (and zero it) */
 653         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 654         if (!host)
 655                 return -ENOMEM;
 656
 657         rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 658         host->io_base = devm_ioremap_resource(&pdev->dev, rc);
 659         if (IS_ERR(host->io_base))
 660                 return PTR_ERR(host->io_base);
 661
 662         host->io_base_phy = rc->start;
 663
 664         mtd = &host->mtd;
 665         nand_chip = &host->nand_chip;
 666         if (pdev->dev.of_node)
 667                 host->ncfg = lpc32xx_parse_dt(&pdev->dev);
 668         if (!host->ncfg) {
 669                 dev_err(&pdev->dev,
 670                         "Missing or bad NAND config from device tree\n");
 671                 return -ENOENT;
 672         }
 673         if (host->ncfg->wp_gpio == -EPROBE_DEFER)
 674                 return -EPROBE_DEFER;
 675         if (gpio_is_valid(host->ncfg->wp_gpio) &&
 676                         gpio_request(host->ncfg->wp_gpio, "NAND WP")) {
 677                 dev_err(&pdev->dev, "GPIO not available\n");
 678                 return -EBUSY;
 679         }
 680         lpc32xx_wp_disable(host);
 681
 682         host->pdata = dev_get_platdata(&pdev->dev);
 683
 684         nand_chip->priv = host;         /* link the private data structures */
 685         mtd->priv = nand_chip;
 686         mtd->dev.parent = &pdev->dev;
 687
 688         /* Get NAND clock */
 689         host->clk = clk_get(&pdev->dev, NULL);
 690         if (IS_ERR(host->clk)) {
 691                 dev_err(&pdev->dev, "Clock initialization failure\n");
 692                 res = -ENOENT;
 693                 goto err_exit1;
 694         }
 695         clk_prepare_enable(host->clk);
 696
 697         nand_chip->cmd_ctrl = lpc32xx_nand_cmd_ctrl;
 698         nand_chip->dev_ready = lpc32xx_nand_device_ready;
 699         nand_chip->chip_delay = 25; /* us */
 700         nand_chip->IO_ADDR_R = MLC_DATA(host->io_base);
 701         nand_chip->IO_ADDR_W = MLC_DATA(host->io_base);
 702
 703         /* Init NAND controller */
 704         lpc32xx_nand_setup(host);
 705
 706         platform_set_drvdata(pdev, host);
 707
 708         /* Initialize function pointers */
 709         nand_chip->ecc.hwctl = lpc32xx_ecc_enable;
 710         nand_chip->ecc.read_page_raw = lpc32xx_read_page;
 711         nand_chip->ecc.read_page = lpc32xx_read_page;
 712         nand_chip->ecc.write_page_raw = lpc32xx_write_page_lowlevel;
 713         nand_chip->ecc.write_page = lpc32xx_write_page_lowlevel;
 714         nand_chip->ecc.write_oob = lpc32xx_write_oob;
 715         nand_chip->ecc.read_oob = lpc32xx_read_oob;
 716         nand_chip->ecc.strength = 4;
 717         nand_chip->waitfunc = lpc32xx_waitfunc;
 718
 719         nand_chip->options = NAND_NO_SUBPAGE_WRITE;
 720         nand_chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
 721         nand_chip->bbt_td = &lpc32xx_nand_bbt;
 722         nand_chip->bbt_md = &lpc32xx_nand_bbt_mirror;
 723
 724         if (use_dma) {
 725                 res = lpc32xx_dma_setup(host);
 726                 if (res) {
 727                         res = -EIO;
 728                         goto err_exit2;
 729                 }
 730         }
 731
 732         /*
 733          * Scan to find existance of the device and
 734          * Get the type of NAND device SMALL block or LARGE block
 735          */
 736         if (nand_scan_ident(mtd, 1, NULL)) {
 737                 res = -ENXIO;
 738                 goto err_exit3;
 739         }
 740
 741         host->dma_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
 742         if (!host->dma_buf) {
 743                 res = -ENOMEM;
 744                 goto err_exit3;
 745         }
 746
 747         host->dummy_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
 748         if (!host->dummy_buf) {
 749                 res = -ENOMEM;
 750                 goto err_exit3;
 751         }
 752
 753         nand_chip->ecc.mode = NAND_ECC_HW;
 754         nand_chip->ecc.size = mtd->writesize;
 755         nand_chip->ecc.layout = &lpc32xx_nand_oob;
 756         host->mlcsubpages = mtd->writesize / 512;
 757
 758         /* initially clear interrupt status */
 759         readb(MLC_IRQ_SR(host->io_base));
 760
 761         init_completion(&host->comp_nand);
 762         init_completion(&host->comp_controller);
 763
 764         host->irq = platform_get_irq(pdev, 0);
 765         if ((host->irq < 0) || (host->irq >= NR_IRQS)) {
 766                 dev_err(&pdev->dev, "failed to get platform irq\n");
 767                 res = -EINVAL;
 768                 goto err_exit3;
 769         }
 770
 771         if (request_irq(host->irq, (irq_handler_t)&lpc3xxx_nand_irq,
 772                         IRQF_TRIGGER_HIGH, DRV_NAME, host)) {
 773                 dev_err(&pdev->dev, "Error requesting NAND IRQ\n");
 774                 res = -ENXIO;
 775                 goto err_exit3;
 776         }
 777
 778         /*
 779          * Fills out all the uninitialized function pointers with the defaults
 780          * And scans for a bad block table if appropriate.
 781          */
 782         if (nand_scan_tail(mtd)) {
 783                 res = -ENXIO;
 784                 goto err_exit4;
 785         }
 786
 787         mtd->name = DRV_NAME;
 788
 789         ppdata.of_node = pdev->dev.of_node;
 790         res = mtd_device_parse_register(mtd, NULL, &ppdata, host->ncfg->parts,
 791                                         host->ncfg->num_parts);
 792         if (!res)
 793                 return res;
 794
 795         nand_release(mtd);
 796
 797 err_exit4:
 798         free_irq(host->irq, host);
 799 err_exit3:
 800         if (use_dma)
 801                 dma_release_channel(host->dma_chan);
 802 err_exit2:
 803         clk_disable_unprepare(host->clk);
 804         clk_put(host->clk);
 805 err_exit1:
 806         lpc32xx_wp_enable(host);
 807         gpio_free(host->ncfg->wp_gpio);
 808
 809         return res;
 810 }
 811
 812 /*
 813  * Remove NAND device
 814  */
 815 static int lpc32xx_nand_remove(struct platform_device *pdev)
 816 {
 817         struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 818         struct mtd_info *mtd = &host->mtd;
 819
 820         nand_release(mtd);
 821         free_irq(host->irq, host);
 822         if (use_dma)
 823                 dma_release_channel(host->dma_chan);
 824
 825         clk_disable_unprepare(host->clk);
 826         clk_put(host->clk);
 827
 828         lpc32xx_wp_enable(host);
 829         gpio_free(host->ncfg->wp_gpio);
 830
 831         return 0;
 832 }
 833
 834 #ifdef CONFIG_PM
 835 static int lpc32xx_nand_resume(struct platform_device *pdev)
 836 {
 837         struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 838
 839         /* Re-enable NAND clock */
 840         clk_prepare_enable(host->clk);
 841
 842         /* Fresh init of NAND controller */
 843         lpc32xx_nand_setup(host);
 844
 845         /* Disable write protect */
 846         lpc32xx_wp_disable(host);
 847
 848         return 0;
 849 }
 850
 851 static int lpc32xx_nand_suspend(struct platform_device *pdev, pm_message_t pm)
 852 {
 853         struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 854
 855         /* Enable write protect for safety */
 856         lpc32xx_wp_enable(host);
 857
 858         /* Disable clock */
 859         clk_disable_unprepare(host->clk);
 860         return 0;
 861 }
 862
 863 #else
 864 #define lpc32xx_nand_resume NULL
 865 #define lpc32xx_nand_suspend NULL
 866 #endif
 867
 868 static const struct of_device_id lpc32xx_nand_match[] = {
 869         { .compatible = "nxp,lpc3220-mlc" },
 870         { /* sentinel */ },
 871 };
 872 MODULE_DEVICE_TABLE(of, lpc32xx_nand_match);
 873
 874 static struct platform_driver lpc32xx_nand_driver = {
 875         .probe          = lpc32xx_nand_probe,
 876         .remove         = lpc32xx_nand_remove,
 877         .resume         = lpc32xx_nand_resume,
 878         .suspend        = lpc32xx_nand_suspend,
 879         .driver         = {
 880                 .name   = DRV_NAME,
 881                 .of_match_table = lpc32xx_nand_match,
 882         },
 883 };
 884
 885 module_platform_driver(lpc32xx_nand_driver);
 886
 887 MODULE_LICENSE("GPL");
 888 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 889 MODULE_DESCRIPTION("NAND driver for the NXP LPC32XX MLC controller");